Waterproofing composition and process for making same



all 3:11;

I Patented Sept. 22, 1925.

UNITED STATES PATENT OFFICE.

WILBUR rmnois CRAWFORD, or Waco, Texas.

WATERPROOFING COMPOSITION AND PROCESS FOR MAKING- SAME.

No Drawing.

7 water-proofing agents, while parafline and ceresin have beenconsidered as less effective to provide a water-proofing compound. Inthe preparation of such water-proofing compound it has been proposed toheat the ingredients ata very low temperatureor at such temperature aswill be required only to melt the mgredients, and furthermore wheregasoline has been employed as a solvent, a very low temperature has beenmaintained when the gasoline has been added.

It is an object of this invention to provide a water-proof compositionwhich when manufactured, has its basic ingredients such as parafline andwool grease, maintained at the boiling temperature so that as gasoline,

a solvent, is poured into the boiling ingredients, a more intimate andmechanical mixture will be had.

Another object of the invention is the provision of a water-proof andmildewproof composition which may be readily applied, will not harden orcrack, give 0 any disagreeable odors, will retain its color, and

which will not only prevent mildew, but will also prevent any form ofbacterial ac tion.

A further object of the invention is the provision of a process in whichparafiine wax may be employed in a water-proof 5 compound as effectivelyas beeswax, and in which the gasoline as' a solvent is added to theboiling parafline with linseed oil and such other coloring matter andbody form ing ingredients as may be desired.

This invention will be best understood from a consideration of thefollowing detailed descri tion; nevertheless, it is to be understood tat the invention is not confined to the disclosure, being susceptible ofsuch treated fabric may Application filed November 18, 1924. Serial No.749,798

changes and modifications which shall define no material departures fromthe salient features of the invention as expressed in the appendedclaims.

Experience has shown where water-proof and mildew-proof canvas ismanufactured 1n large quantities and used in a very hot chmate, such asTexas, the following ingredients and in the proportions named, such as200 pounds of parafline, 10 gallons of boiled linseed oil, pounds of dryyellow ochre, 20 pounds of litharge (lead oxide), 6 pounds of dry burntsienna, 4 pounds of dry burnt umber, 30 gallons of gasoline,

20 pounds of degrasor wool grease will I provide a cloth which ispliable, soft, waterproof, mildew-proof and free from bacterial reactionafter indefinite exposure.

In carrying out the process, the parafline and wool grease are heatedtogether in a steam boiler until they come to ebullition.

Lmseed oil is placed in a vessel, and the litharge is mixed with thelinseed-oil and thoroughly stirred until no particles of the llthargeare visible. To this composition in the vessel, the burnt sienna, burntumber and yellow ochre are added, and the whole is stirred until it hasbecome a liquid mass devoid of lumps. This mixture is then poured intothe boiling parafline and wool grease with thorough mixing, and whilethese ingredients are in the state of ebullition the quantity. ofgasoline is slowly poured into the same and thoroughly incorporated. Theentire composition is then held to boiling point for approximately fiveminutes.

The liquid mass is maintained at about 100 degrees Fahrenheit, and thematerial to be water-proofed is saturated by drawing the fabric throughthe composition place in a tank, and then the fabric is passed throughrollers which ress out an excess of the water-proofing. T e fabric isdried by causing air tocirculate about the same for approximately thirt-six hours although the e applied or used after twelve hours of drying.

It requires approximately gallons of composition to proof 1500 yards of29 inch, l

8 ounce duck or canvas, the quantit varying according to the width, weigt, and

length of the material.

Parain'ne in a wax which isused as a, base and when properly treatedwill form an absolute water-proofing base, equal in every respect to thewell known and expensive beeswax. It is resistant to acid, repellant towater and will thoroughly penetrate canvas when heated to a temperatureof 112 degrees Fahrenheit. By the treatment of the. parafiine with theother materials, and particularly with'the asoline when the paraffinehas been raisef to a state of boiling, the fabric material whenwater-proofed will remain in a soft pliable condition, and will notdeteriorate or lose its pliability after prolonged exposure to heat orcold.

De as or wool greaseis used for its water repe ant properties and tooffset the hardening qua ities of the paraifine, thereby making canvaswhich is water-proofed with the composition more pliable.

Boiled linseed oil is employed for not only its water repellingproperties, but as a binder for the incorporation of the dryingredlents.

Litharge is used to increase the drying properties of the oils and theyellow ochre as a filler and to aid in the coloring.

Burnt sienna and burnt umber are employed principally for their coloringproperties.

Gasoline is employed as a solvent and where added to the boilingparafiine and wool ease and the other ingredients causes the ingredientsto be thoroughly dissolved and intimately associated in a physicalmixture. The ready evaporation of the gasoline acts as a drier for thematerial.

It must be borne in mind that the gasoline is thoroughly stirred intothe mass of boiling ingredients so that the minute particles of thevarious ingredients have a closer physical association than can beobtained by merely attempting to dissolve them by a solvent when 0001.

-Fabrics so treated are manufactured on a large scale, and experiencehas shown that such fabrics withstand the intense heat of the State ofTexas and other places without deterioration, remain waterproof and donot mildew under unusual circumstances after prolonged exposure.

It is well known that linseed oil has a tendency to injure fabrics, butwhen so incorporated with the other ingredients in the lplfo r 1i lzrgoportioltrs aid disslolved lwivgile at e i oint t e gaso ine, a anger ofthe breakin d wn of the fibers of the fabrics is elimmated.

One of the most important advantages fl owin from the use of thiscomposition resldes 1n thefact that-the article treated is n ot.easilyignited and is therefore fire-resisting to a substantial degree. Also,the extensive commercial use of the invention has demonstrated that theproduct treated 13 not susceptible to lpontaneous combustion,

as in thecase of canvas and the like, treated with other known processesand compositions.

A substantial saving in time is brought about by the use of thehereindescribed process and composition,-since the time for preparationof the composition requires only about one hour, as against twenty-fourhours ochre, 20 pounds of litharge (lea oxide),

6 pounds of dry burnt sienna, 4 ounds of dry burnt umber, and 30 gallons0 gasoline.

2. A rocess of forming a water-proofing and mil ew-proofing compositionwhich comprises heating parafiine and wool grease to the boiling point,thoroughly mixing linseed oil, litharge, burnt sienna, burnt umber andyellow ochre and adding this mixture to the boiling paraifine and woolgrease, then adding gasoline and. maintaining the same at the boilingpoint.

3. A process of forming a water-proofing and mildew-proofing composition-which comprises raising paraifine and wool grease ,to the state ofebullition and separately mixing linseed oil and litharge, adding to thesecond mixture burnt sienna, burnt umber and yellow ochre, adding thismixture to the boiling parafline and wool grease and maintaining thewhole at the boiling point for approximately five minutes.

. 4.- The hereindescribed process of forming a'waterproofing and mildewproofing com position which consists in mixing parafline, wool grease,linseed oil, litharge, burnt sienna, burnt umber, yellow ochre and gasoline and bringing all the ingredients, including the gasoline to aboiling point during mixing.

5. The hereindescribed rocess of forming a waterproofing and mil ewproofing composition which consists in mixing parafiine, wool grease,linseed oil, litharge, burnt sienna, burnt umber, yellow ochre andgasoline and bringin cluding the gasoline, to a boiling point duringmixing and maintaining the same at the boiling point during thecommin'gling of the ingredients. y

6. A process of forming a waterproofing g-- all the ingredients, in-

and mildew proofing composition which mixing linseed oil and litharge,adding to the second mixture burnt sienna, burnt umber, and yellowochre, and adding gasoline during boiling to the mixture.

7. A process for forming a water-proofing and mildew-proofingcomposition for textiles which comprises mixing parafiine wax,

iyool grease, linseed oil, coloring matter and gasoline and thenbringing all the ingredients, including the gasoline, to the boiling 10point during mixing. r

In testimony whereof, I affix my signature.

WILBUR FRANCIS CRAWFORD.

